The nonlocal chiral effective theory is applied to investigate the electromagnetic and strange form factors of nucleon. The bubble and tadpole diagrams are included in the calculation. With the contributions from bubble and tadpole diagrams, the obtained electromagnetic form factors are close to the results without these contributions as long as the low energy constants
Dimuon events induced by charm-quark productions from neutrino deep inelastic scattering (DIS) processes have been studied in traditional DIS experiments for decades. The recent progress in neutrino telescopes makes it possible to search such dimuon events at energies far beyond laboratory scale. In this paper, we construct a simulation framework to calculate yields and distributions of dimuon signals in an IceCube-like km3 scale neutrino telescope. Due to experimental limitation in the resolution of double-track lateral distance, only dimuon produced outside the detector volume are considered. Detailed information about simulation results for ten years exposure is demonstrated. Both an earlier work [
In this study, the gravitational decoupling approach via extended geometric deformation is utilized to generate analytical black hole solutions owing to its simplicity and effectiveness. Considering the external fields surrounding Schwarzschild AdS black holes, we derive hairy black hole solutions in asymptotic AdS spacetime, satisfying the strong and dominant energy conditions. Moreover, we find that if the black hole spacetime is a fluid system, the fluid under each of these conditions is anisotropic.
Using the perturbative QCD approach, we studied the effects from hadronic structure of photon on the pure annihilation rediative decays
The charge exchange spin-dipole (SD) excitations of
In this paper, we perform the Tsallis Blast-Wave analysis on the transverse momentum spectra of identified hadrons produced in a wide range of collision systems at the Large Hadron Collider (LHC) including pp, pPb, XeXe and PbPb collisions. The kinetic freeze-out properties are investigated across these systems varying with the event multiplicity. We find that the extracted kinetic freeze-out temperature, radial flow velocity and the non-extensive parameter exhibit a universal scaling behavior for these systems with very different geometric size, especially when the independent baryon Tsallis non-extensive parameter is considered. This universality may indicate the existence of a unified partonic evolution stage in different collision systems at the LHC energies.
We present a general method of constructing unfactorizable on-shell amplitudes (amplitude basis), and build up their one-to-one correspondence to the independent and complete operator basis in effective field theory (EFT). We apply our method to the Standard Model EFT, and identify the amplitude basis in dimension 5 and 6, which correspond to the Weinberg operator and operators in Warsaw basis except for some linear combinations.
The 12C+12C reaction rate plays an essential role in stellar evolution and nucleosynthesis. Nevertheless, uncertainties of this reaction rate are still large. We calculated a series of stellar evolution models with the near solar abundance from the zero-age main-sequence through presupernova stages for the initial masses of 20 M
Within the NRQCD factorization framework, we compute the next-to-leading-order QCD corrections to the gluon fragmentation into the
The fission yield data in 14 MeV energy neutron induced fission of 238U play an important role for decay heat calculation and for generation-IV reactor designs. In order to measure fission product yields (FPYs) of 238U induced by 14 MeV neutrons accurately, the cumulative yields of fission products ranging from 92Sr to 147Nd in 238U(n, f) with 14.7 MeV neutron have been determined using an off-line γ-ray spectrometric technique. The 14.7 MeV quasi-monoenergetic neutron beam was provided by K-400 D-T neutron generator at China Academy of Engineering Physics (CAEP). Fission products were measured by a low background high purity germanium gamma spectrometer. The neutron flux was obtained from 93Nb (n,2n)92mNb reaction, and the mean neutron energy was calculated by the cross-section ratios for the 90Zr(n,2n)89Zr and 93Nb(n,2n)92mNb reactions. With a series of corrections, high precision cumulative yields of 20 fission products were obtained. Our FPYs for 238U(n,f) reaction at 14.7 MeV were compared with the existing data at 14 MeV from Experimental Nuclear Reaction Data and Evaluated Nuclear Data, respectively. They are helpful to design of generation-IV reactor and the construction of evaluated fission yield database.
We used the monodromy method to investigate the asymptotic quasinormal modes of regular black holes based on the explicit Stokes portraits. We found that for regular black holes with spherical symmetry and a single shape function, the analytical forms of the asymptotic frequency spectrum are not universal and do not depend on the multipole number, but rather on the presence of complex singularities and the trajectory of asymptotic solutions along the Stokes lines.
The motto of this work is to generate a general formalism of
The CDF collaboration has announced a new measurement result of the W boson mass recently, and it is in tension with the standard model (SM) prediction. In this paper, we will explain this anomaly in the vector-like quark (VLQ)
In this work, the gravitational deflection angle of photon in the weak field limit (or the weak deflection angle) and shadow cast by the electrically charged and spherically symmetric static Kiselev black hole (BH) in the string cloud background are investigated. The influence of the BH charge Q, the quintessential parameter γ and the string cloud parameter a is studied on the weak deflection angle using the Gauss-Bonnet theorem, on the radius of photon spheres and on the size of the BH shadow in the spacetime geometry of the charged-Kiselev BH in string clouds. Moreover, we study the effects of plasma (uniform and non-uniform) on the weak deflection angle and on the shadow cast by the charged-Kiselev BH surrounded by the clouds of strings. In the presence of uniform/nonuniform plasma medium, increase in the cloud of string parameter a, increases the deflection angle α. On the other hand decrease in the BH charge Q, decreases the deflection angle. Further we observe that an increase of the BH charge Q causes a decrease in the size of the shadow of the BH. We notice that with increase in the values of the parameters γ and a, the size of the BH shadow also increases and therefore the intensity of the gravitational field around the charged-Kiselev BH in string clouds increases. Thus the gravitational field of the charged-Kiselev BH in string cloud background would be stronger than the field produced by the pure Reissner-Nordstrom BH. Moreover, we use the data released by the Event Horizon Telescope (EHT) collaboration, for the supermassive BHs M87* and Sgr A*, to obtain constraints on the values of the parameters γ and a.
By solving two body Dirac equations with potentials at finite temperature, we calculated the dissociation temperature
In this paper, we investigate the influence of the angular momentum of a charged particle around Kerr-Newman-Taub-NUT black holes on the Lyapunov exponent, and find spatial regions where the chaos bound is violated. The exponent is obtained by solving the determination of eigenvalues of a Jacobian matrix in the phase space. Equilibrium positions are obtained by fixing the charge-to-mass ratio of the particle and changing its angular momentum. For certain values of the black holes' electric charge, NUT charge and rotational parameter, a small angular momentum of the particle, even if zero angular momentum, causes the violation of the bound. This violation disappears at a certain distance from the event horizon of the non-extremal Kerr-Newman-Taub-NUT black hole when the angular momentum increases to a certain value. When the black hole is extremal, the violation always exists no matter how the angular momentum changes. The ranges of the angular momentum and spatial regions for the violation are found. The black holes and particle rotating in the same direction and in the opposite directions are discussed.
The reaction cross-sections of 238U (n, γ)239U have been experimentally determined at the neutron energies of 6.117 ± 0.119 MeV, 4.626 ± 0.086 MeV and 3.622 ± 0.348 MeV employing the relative activation approach along with off-line γ-rays spectroscopy method. The D (d, n)3He reaction was utilized to obtain monoenergetic neutrons of the required energy and the 197Au (n, γ)198Au reaction cross-sections were adopted as the referential standard to ascertain the neutron capture cross-sections of 238U. Furthermore, the effects of low-energy scattered neutrons, neutron fluence fluctuation, the counting geometric corrections when measuring γ-rays, neutrons and γ-rays self-absorption caused by samples thickness have been considered and revised in the present work. For comparison with experimental results, the cross-sections of 238U (n, γ)239U reaction were calculated theoretically with original parametric TALYS-1.9 program. The experimental measurements were also in contrast with previous experimental results and the evaluation data available for ROSFOND-2010, CENDL-3.2 and ENDF/B-VIII.0.
The ground vector
In relativistic heavy ion collisions, the fluctuations of initial entropy density convert to correlations of final state hadrons in momentum space, through collective expansion of the strongly interacting QCD matter. We ask by using a (3+1)D viscous hydrodynamic program CLVisc whether the nuclear structure, which provides initial state fluctuations as well as correlations, can affect the final state of heavy ion collisions, whether one can find signals of α cluster structure in oxygen using the final state observables in
The paper considers a principal possibility of creating a nuclear light source of the vacuum ultra violet (VUV) range based on the
An α-transfer and cluster-decay experiment,
An analysis of the breakup of the
The decay constants of the low lying S-wave
So far, the behavior of the pionic leading-twist distribution amplitude (DA)
Recently, some progresses have been made on the double-heavy tetraquarks in the experiments, such as
Using electron-positron annihilation data samples corresponding to an integrated luminosity of 4.5 fb
In this article, a new class of solutions of Einstein-Maxwell field equations of relativistic strange quark star obtained in dimensions
Besides the Coulomb displacement energy, the residual differences of binding energies between mirror nuclei (a pair of nuclei with the same mass number plus the interchanged proton and neutron numbers) are contributed to the shell effect via the valence scheme in the present study. To this end, one linear combining type of the valence nucleon number, namely
Using gauge/gravity duality, we study the potential energy and the melting of triply heavy baryon at finite temperature and chemical potential in this paper. First, we calculate three-quark potential and compare the results with quark-antiquark potential. With the increase of temperature and chemical potential, the potential energy will decrease at large distances. It is found that the three-quark potential will have an endpoint at high temperature and/or large chemical potential, which means triply heavy baryons will melt at enough high temperature and/or large chemical potential. We also discuss screening distance which can be extracted from the three-quark potential. At last, we draw the melting diagram of triply heavy baryons in the
A new Goldstone particle named Majoron is introduced in order to explain the origin of neutrino mass by some new physics models assuming that neutrinos are Majorana particle. By expanding signal region and using likelihood analysis, it becomes possible to search for Majoron at experiments that is originally designed to search for
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